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Commit | Line | Data |
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6aff3115 WD |
1 | |
2 | This is a demo implementation of a Linux command line tool to access | |
3 | the U-Boot's environment variables. | |
4 | ||
d0fb80c3 WD |
5 | For the run-time utiltity configuration uncomment the line |
6 | #define CONFIG_FILE "/etc/fw_env.config" | |
7 | in fw_env.h. | |
8 | ||
6de66b35 MK |
9 | For building against older versions of the MTD headers (meaning before |
10 | v2.6.8-rc1) it is required to pass the argument "MTD_VERSION=old" to | |
11 | make. | |
12 | ||
d0fb80c3 WD |
13 | See comments in the fw_env.config file for definitions for the |
14 | particular board. | |
15 | ||
16 | Configuration can also be done via #defines in the fw_env.h file. The | |
6aff3115 WD |
17 | following lines are relevant: |
18 | ||
19 | #define HAVE_REDUND /* For systems with 2 env sectors */ | |
20 | #define DEVICE1_NAME "/dev/mtd1" | |
21 | #define DEVICE2_NAME "/dev/mtd2" | |
d0fb80c3 WD |
22 | #define DEVICE1_OFFSET 0x0000 |
23 | #define ENV1_SIZE 0x4000 | |
24 | #define DEVICE1_ESIZE 0x4000 | |
56086921 | 25 | #define DEVICE1_ENVSECTORS 2 |
d0fb80c3 WD |
26 | #define DEVICE2_OFFSET 0x0000 |
27 | #define ENV2_SIZE 0x4000 | |
28 | #define DEVICE2_ESIZE 0x4000 | |
56086921 | 29 | #define DEVICE2_ENVSECTORS 2 |
6aff3115 WD |
30 | |
31 | Current configuration matches the environment layout of the TRAB | |
32 | board. | |
33 | ||
34 | Un-define HAVE_REDUND, if you want to use the utlities on a system | |
d0fb80c3 WD |
35 | that does not have support for redundant environment enabled. |
36 | If HAVE_REDUND is undefined, DEVICE2_NAME is ignored, | |
37 | as is ENV2_SIZE and DEVICE2_ESIZE. | |
38 | ||
39 | The DEVICEx_NAME constants define which MTD character devices are to | |
40 | be used to access the environment. | |
41 | ||
42 | The DEVICEx_OFFSET constants define the environment offset within the | |
43 | MTD character device. | |
44 | ||
45 | ENVx_SIZE defines the size in bytes taken by the environment, which | |
46 | may be less then flash sector size, if the environment takes less | |
47 | then 1 sector. | |
48 | ||
6aff3115 | 49 | DEVICEx_ESIZE defines the size of the first sector in the flash |
d0fb80c3 | 50 | partition where the environment resides. |
56086921 GL |
51 | |
52 | DEVICEx_ENVSECTORS defines the number of sectors that may be used for | |
53 | this environment instance. On NAND this is used to limit the range | |
54 | within which bad blocks are skipped, on NOR it is not used. |